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FREQUENCY MODULATOR AND FM TRANSMISSION CIRCUIT USING THE SAME

  • US 20100213916A1
  • Filed: 12/05/2006
  • Published: 08/26/2010
  • Est. Priority Date: 12/06/2005
  • Status: Active Grant
First Claim
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1. A frequency modulator comprising:

  • an operational amplifier having an inverting input terminal to which an input signal is input via a first resistor;

    a second resistor provided on a feedback path between an output terminal and the inverting input terminal of the operational amplifier;

    a voltage controlled oscillator to which an output signal from the operational amplifier is input;

    a frequency divider which frequency-divides an output signal from the voltage controlled oscillator;

    a phase comparator which compares an output signal from the frequency divider with a reference clock signal and outputs a voltage according to a phase difference; and

    a filter which removes a high-frequency component of an output voltage from the phase comparator and outputs the voltage to a non-inverting input terminal of the operational amplifier.

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